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Basis of Presentation and summary of significant accounting policies (Details) - USD ($)
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Nature of operations    
Goodwill impairment $ 0 $ 0
Projected cash flows period 5 years  
Fair value assets, transfers from level 1 to 2 $ 0 0
Fair value assets, transfers from level 2 to 1 0 0
Fair value assets, transfers into or out of level 3 0 0
Fair value liabilities, transfers from level 1 to 2 $ 0 $ 0